In such a complex world, sometimes simple is best, and what could be simpler than a bumper sticker? Menlo School philosophy teacher Jack Bowen isn't fooled, however. In the book "If You Can Read This: The Philosophy of Bumper Stickers," he points out that restricting yourself to eight or nine words can be far more complex than you would expect. He tells Anne Strainchamps how he got interested in bumper stickers.